Project drives performance gains in osmotic power

It is hoped the associated performance increases will drive commercialisation of this type of energy generation, which is now at the pilot stage.

Osmotic power exploits topographical areas where seawater and fresh water meet. By placing a separating membrane between the two fluids, fresh water permeates through the membrane to the seawater side, resulting in an increase in pressure on this side, which is used to drive a turbine and generate electrical energy.

To achieve the required energy efficiency, as much as five million square metres of membrane will be needed to operate an osmotic generating plant with a production output of 25MW. This will be achieved by packing membranes in special modules, with each cubic metre of module containing up to a thousand square metres of membrane.

‘The most challenging part is still to get efficient enough membranes — but we are close now,’ Edvard Sivertsen, a project manager at SINTEF Building and Infrastructure, told The Engineer.